Visualization of trans-homolog enhancer-promoter interactions at the Abd-B hox locus in the Drosophila embryo

Matthew Ronshaugen, Mike Levine

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

The Hox gene Abdominal-B (Abd-B) controls the morphogenesis of posterior abdominal segments in Drosophila. Expression is regulated by a series of 3′ enhancers that are themselves transcribed. RNA FISH was used to visualize nascent transcripts associated with coding and noncoding regions of Abd-B in developing embryos. Confocal imaging suggests that distal enhancers often loop to the Abd-B promoter region. Surprisingly, enhancers located on one chromosome frequently associate with the Abd-B transcription unit located on the other homolog. These trans-homolog interactions can be interpreted as the direct visualization of a genetic phenomenon known as transvection, whereby certain mutations in Abd-B can be rescued in trans by the other copy of the gene. A 10 kb sequence in the 3′ flanking region mediates tight pairing of Abd-B alleles, thereby facilitating trans looping of distal enhancers. Such trans-homolog interactions might be a common mechanism of gene regulation in higher metazoans.

Original languageEnglish (US)
Pages (from-to)925-932
Number of pages8
JournalDevelopmental cell
Volume7
Issue number6
DOIs
StatePublished - Dec 2004

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Developmental Biology
  • Cell Biology

Fingerprint Dive into the research topics of 'Visualization of trans-homolog enhancer-promoter interactions at the Abd-B hox locus in the Drosophila embryo'. Together they form a unique fingerprint.

Cite this